This is a cool and fun speculative video showing how augmented reality may shape the future of gaming and physical exercise, specifically martial arts. Because if there's one thing that needs augmenting, dude, it's kung fu:

The video assumes the augmented reality aspect will come from digital contact lenses, which I'm guessing is about 10 years away. But you could get the same action from digital displays embedded in eyeglasses, and I'd speculate it's possible those could be mass market in less than 5 years.

Now here's the part that makes me think about virtual worlds: What if it wasn't just the kung fu guys who were augmented? What if the nearby trees were overlaid with a display that made them seem like, say, robot guards, or tall marble pillars? And the dirt path were made to seem like cobblestone leading to a castle (which was actually just an old water tower)? Then the entire experience would become an alternate virtual world overlaid with ours. And all things considered, what with it being out in the open air requiring lots of running and jumping, wouldn't that be a better future of virtual worlds, as opposed to sitting somewhere dark and inside, staring at an unmoving screen?